IBM Numeric Keypad for IBM PS/2 L40 SX

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Admiral Shark's Keyboards (CC BY-NC-SA 4.0)

1991 Q1 Model M3 L40 SX Numeric Keypad IBM buckling sleeves (M3/M4 rod-actuated type)More info on this keyboard

eg, P/Ns 1396199, 1396571, 1396572, 1396573, 1396574

IBM-made 17-key numeric keypad option for the IBM 8543 Personal System/2 L40 SX notebook computer. This was the first discrete device to use IBM buckling sleeve keyswitches. It had a modular 8P7C to PS/2-like plug cable with a special pinout, a pass-through port for a PS/2 mouse, and a hinged but removable cover.